Koolasuchus

Koolasuchus was a giant amphibian of the Cretaceous Period that measured an astounding five metres from nose to tail and weighed half a tonne. Its wide, heavy head made up about a sixth of the total body length. Eyes on the top of the head allowed Koolasuchus to be an effective aquatic ambush predator, that struck at small mammals and dinosaurs coming to the water's edge for a drink. It was a survivor from an earlier time, the majority of other temnospondyl amphibians having perished at the end of the Triassic. Since it lived in the polar regions, Koolasuchus probably hibernated to get through the winter, as many modern salamanders do today.